<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script>
var arr=[1,2,3,4];

arr.a=12;

arr.show=function ()
{
	alert(this.a);
};

oDiv.onclick=function ()
{
	alert(this);
};

arr.show();
</script>
</head>

<body>
</body>
</html>
